Improved anchor



UNITED STATES PATENT OFFICE.

CHARLES E. MARSHALL, OF DIGBY, NOVA SCOTIA.

IMPROVED ANCHOR.

Specidcation forming part of Letters Patent No. 50,542, dated October 17, 1865.

To all whom t may concern:

Bc it known that I, C. E. MARSHALL, of Digby, iu the Province ot' Nova Scotia, have invented a new and useful Improvement in Anchors; and I hereby declare the following` to be afull and exact description of the same, reference being had to the accompanying drawings, making part of this specitica-tion, in which- Figure l represents a view of my improved anchor; Fig. 2, the same in operation; Fig. 3, a section of the anchor or crown, showing the method ot'a-ttaching the dukes.

The object of my invention is to produce an anchor which, when of equal weight, shall possess largely more holding-power, be more convenient in use, and less liable to irreparable accident than those of ordinary construction.

My invention consists in furnishing the shank ofthe anchor with vibrating dukes, so that they may revolve in the arc of a circle in such manner as always to turn to the ground side of the shank, however the anchor may be placed. The dukes revolve upon a pivot passing through the crown ot the anchor. rlhe dukes turn in the arc of a circle indicated by the curved line E E, Fig. 1.

lt also consists in constructing on the crown of the anchor two shoulders, which restrict the revolution of the dukes and help sustain the strain when the anchor is holding. The dukes being prevented by the shoulders from de scribing a complete revolution, it is obvious the anchor can be placed in no posit-ion when the stock is horizontal in which the dukes will not incline to the under side.

My invention further consists in making the dukes straight and dtting them on their inner sides, where they come in contact with the shank, with sockets, or projections which peiletrate into recesses in the crown of the anchor,

and, in connection with the shoulders before described, relieve the pivot from all strain, except such as is occasioned by the mere weight ofthe dukes. The pivot F passes through a hole in the sockets. The shoulders are shown at S, Figs. 1, 2, and 3, and the sockets at G O, Fig. 3. The dukes are furnished with barbs or spurs D D, Figs. l and 2. The object of these is twofold: drst, to increase the holding-power oftheanchor; and,second,when the anchor is lying dat upon the holding-surface with the stockin a horizontal position, by penetrating the earth, to turn the dukes in such manner that they will commence holding as soon as any draft is made on the cable.

The angle which the dukes make with the shank lcan be regulated by varying thelcngth ofthe curved shoulders S S, before described.

Each duke is provided wit-haseparate socket, so that it can turn upon the pivotindependently of the other.

The shankis dtted with ajoint, (shown at K,

` Fig. 1,) to prevent fouling of the anchor when the ship changes her position in relation toit, and for convenience of stowing.

The loop H is designed for convenience of fishing and securing the anchor to the'ships side.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The combination of the shouldersSS, the sockets C O, and the perforated crown, as and for the purposes described.

2. The combination of the spurs D D with the straight vibrating dukes E E, as and for the purposes specified.

CHARLES E. MARSHALL.`

Witnesses:

WILLIAM H. CLIFFORD, SEWELL C. STRAU'I. 

